There was a double knock at the door.

门上接连敲了两声。

youdao

Please knock double knocks AT the door before entering.

请先敲两下门再进来。

youdao

But as the big woods of the Mississippi Delta were chopped down, the woodpecker-with its distinctive tooting call and double knock-was slowly exterminated.

但随着密西西比三角洲的森林被砍伐殆尽，这种能制造出独特的“嘟嘟，嘟嘟”啄木声的啄木鸟已经渐渐灭绝了。

youdao

Knock yourself out: The GamePad can double as the main screen in most games.

CNN: Nintendo Wii U review: A tale of two screens

According to analysts' estimates, it could easily knock down the country's annual output by a double digit percentage figure.

NPR: Anti-Euro Party A Wildcard In German Elections

Then a double by Rangers second baseman Ian Kinsler, and a big RBI knock from Angels rookie sensation Mike Trout in the seventh tied the game up.

FORBES: Connect